public class demo1 {

    private static Object locker1= new Object();
    private static Object locker2 = new Object();

    public static void main(String[] args) {

        Thread t1 = new Thread(()->{
            synchronized (locker2){
                try {
                    locker2.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            System.out.println("A");
        });
        Thread t2= new Thread(()->{
            synchronized (locker1){
                try {
                    locker1.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

            System.out.println("B");

            synchronized (locker2){
                locker2.notify();
            }
        });
        Thread t3= new Thread(()->{
            System.out.println("C");

            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            synchronized (locker1){
                locker1.notify();
            }


        });
        t1.start();
        t2.start();
        t3.start();
    }
}
